A common theme is the battle between good and evil, with Sonic representing good and Eggman representing evil. They constantly fight over things like power, territory, or the Chaos Emeralds.
A common theme is the power struggle. Eggman is always trying to gain power over Sonic's world, and Sonic is there to stop him. Another theme is redemption. Sometimes fanfics explore the idea of Eggman having a change of heart.
The dynamic between Sonic and Eggman. They are arch - enemies, so seeing how they interact in fanfics, whether it's in a battle of wits or an unexpected team - up, is always exciting.
Sure. One popular Sonic X Eggman fanfiction is 'The Battle for Chaos Emeralds'. It has an interesting plot where Sonic and Eggman are in a constant struggle for the powerful Chaos Emeralds. Another one is 'Eggman's New Scheme' which shows Eggman devising a very elaborate and unexpected plan against Sonic and his friends.
There could also be some new characters introduced in this fanfiction. Maybe a mysterious figure who has some inside knowledge about Eggman's operations. This new character could either help Sonic or cause some trouble depending on their motives. Another possibility is a group of creatures native to the area where the battle takes place. They could be initially scared of Sonic and his friends but then end up helping them in some way.
One popular 'sonic x eggman fanfic' is 'The Battle Beyond Dimensions'. It has an exciting plot where Sonic and Eggman are thrown into an alternate dimension and have to find a way back while dealing with new threats.
Some 'eggman x young sonic fanfic' might be centered around a parallel universe concept. In this universe, Eggman and Sonic have a completely different relationship. Maybe they are allies from the start, or there are some special circumstances that force them to work together. These kinds of fanfics often play with different character traits and plot twists to create a unique reading experience.
First, understand the characters well. Eggman is a brilliant but egotistical villain, and Sonic is a heroic and speedy hedgehog. Keep their personalities consistent. For example, Eggman would always be scheming and Sonic would always be ready to save the day. Also, create an interesting plot that involves their relationship, like a battle of wits or an unexpected alliance.
A plot could involve Eggman creating a device that accidentally swaps their minds. Sonic now has to figure out how to use Eggman's technology to reverse the process while in Eggman's body, and Eggman, in Sonic's body, is forced to experience what it's like to be the hero for a while. This would lead to some comical and also thought - provoking situations as they both learn about the other's perspective.